Stream and lake data collected since 2001 were summarized by grouping by each site (stream site or lake) and the median value over the period of the record was calculated. This was done to reduce the influence of waterbodies which were sampled multiple times skewing the resulting summary statistics. For lake data, epilimnetic and hypolimnetic data were analyzed separately.
The secondary grouping variables used were Level III Ecoregion and Waterbody Classification. To simplify the number of categories for waterbody classifications, (T) and (TS) designations were ignored in the summary. Also, waterbodies designated as AA-S were treated as AA.
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 46.50 | 67.00 | 322.50 | 453.5 | 864.30 | 2365.0 | 39 |
| 59 | Northeastern Coastal Zone | 140.00 | 180.00 | 248.00 | 257.9 | 376.70 | 537.5 | 13 |
| 60 | Northern Allegheny Plateau | 134.75 | 170.00 | 225.50 | 228.0 | 253.50 | 263.0 | 11 |
| 61 | Erie Drift Plain | 167.00 | 167.00 | 167.00 | 167.0 | 167.00 | 167.0 | 1 |
| 62 | North Central Appalachians | 122.50 | 140.00 | 157.50 | 161.0 | 171.50 | 175.0 | 2 |
| 67 | Ridge and Valley | 162.00 | 246.25 | 333.12 | 336.9 | 453.95 | 608.5 | 30 |
| 83 | Eastern Great Lakes Lowlands | 103.25 | 247.50 | 392.25 | 397.0 | 1487.50 | 1770.0 | 36 |
| 84 | Atlantic Coastal Pine Barrens | 117.50 | 117.50 | 117.50 | 117.5 | 117.50 | 117.5 | 1 |
Figure 2: Stream Ecoregional TDS (mg/L) Distribution
Figure 3: Linear regression of TDS (mg/L) and Specific Conductance (uS/cm)
Figure 4: Actual vs. Predicted TDS (mg/L)
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 24.40 | 46.52 | 97.83 | 122.31 | 277.63 | 2559.73 | 678 |
| 59 | Northeastern Coastal Zone | 192.76 | 278.42 | 450.31 | 479.39 | 707.41 | 11134.94 | 397 |
| 60 | Northern Allegheny Plateau | 78.07 | 145.42 | 234.52 | 251.93 | 356.87 | 1826.54 | 917 |
| 61 | Erie Drift Plain | 143.28 | 177.26 | 208.54 | 213.05 | 254.19 | 490.32 | 73 |
| 62 | North Central Appalachians | 46.16 | 74.16 | 129.22 | 143.96 | 250.38 | 3465.95 | 100 |
| 64 | Northern Piedmont | 245.31 | 280.54 | 418.82 | 428.56 | 9076.04 | 11343.46 | 30 |
| 67 | Ridge and Valley | 83.01 | 207.84 | 313.79 | 328.02 | 501.03 | 766.47 | 106 |
| 83 | Eastern Great Lakes Lowlands | 146.27 | 272.22 | 423.26 | 461.02 | 805.36 | 3135.13 | 941 |
| 84 | Atlantic Coastal Pine Barrens | 92.45 | 131.33 | 175.29 | 181.32 | 229.39 | 305.81 | 41 |
Figure 5: Stream Ecoregional (predicted) TDS (mg/L) Distribution
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 14.69 | 23.61 | 52.21 | 65.33 | 165.54 | 489.59 | 190 |
| 59 | Northeastern Coastal Zone | 151.45 | 213.78 | 319.27 | 365.26 | 753.06 | 7828.50 | 55 |
| 60 | Northern Allegheny Plateau | 48.33 | 112.45 | 175.43 | 194.70 | 297.47 | 705.04 | 91 |
| 61 | Erie Drift Plain | 129.39 | 157.93 | 165.13 | 167.32 | 200.68 | 227.59 | 11 |
| 62 | North Central Appalachians | 32.62 | 48.21 | 85.29 | 86.78 | 130.66 | 191.52 | 21 |
| 64 | Northern Piedmont | 217.36 | 243.57 | 289.31 | 297.05 | 339.05 | 356.90 | 8 |
| 67 | Ridge and Valley | 101.58 | 133.87 | 175.85 | 178.96 | 263.83 | 268.59 | 17 |
| 83 | Eastern Great Lakes Lowlands | 94.27 | 174.50 | 334.00 | 406.57 | 876.06 | 1533.20 | 112 |
| 84 | Atlantic Coastal Pine Barrens | 77.72 | 112.72 | 166.94 | 178.64 | 190.97 | 206.29 | 20 |
Figure 6: Predicted Lake Epilimnetic TDS (mg/L) Distribution
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 19.96 | 32.26 | 49.93 | 52.86 | 181.56 | 509.88 | 118 |
| 59 | Northeastern Coastal Zone | 192.79 | 225.33 | 368.65 | 473.30 | 1068.31 | 1964.04 | 19 |
| 60 | Northern Allegheny Plateau | 76.00 | 150.61 | 211.04 | 228.30 | 278.66 | 407.31 | 34 |
| 61 | Erie Drift Plain | 141.81 | 145.87 | 164.67 | 171.73 | 186.10 | 188.62 | 9 |
| 62 | North Central Appalachians | 50.20 | 77.60 | 98.74 | 106.90 | 150.58 | 164.47 | 12 |
| 64 | Northern Piedmont | 244.34 | 249.71 | 255.08 | 256.15 | 259.37 | 260.44 | 2 |
| 67 | Ridge and Valley | 141.25 | 204.20 | 218.85 | 226.53 | 297.13 | 325.20 | 7 |
| 83 | Eastern Great Lakes Lowlands | 97.42 | 192.76 | 426.56 | 481.60 | 1213.89 | 1459.37 | 43 |
| 84 | Atlantic Coastal Pine Barrens | 55.53 | 55.53 | 55.53 | 55.53 | 55.53 | 55.53 | 1 |
Figure 7: Predicted Lake Hypolimnetic TDS (mg/L) Distribution
| Waterbody Class | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|
| A | 61.31 | 162.47 | 266.56 | 272.86 | 473.05 | 3465.95 | 238 |
| A-S | 159.52 | 161.12 | 162.44 | 162.51 | 164.23 | 164.95 | 7 |
| AA | 27.21 | 81.46 | 197.95 | 241.91 | 350.42 | 726.17 | 110 |
| B | 74.47 | 179.80 | 294.77 | 336.02 | 638.20 | 11343.46 | 465 |
| C | 74.98 | 167.68 | 292.93 | 330.83 | 586.69 | 3135.13 | 2351 |
| D | 97.52 | 181.46 | 308.29 | 361.27 | 573.17 | 718.00 | 81 |
Figure 8 :Stream (predicted) TDS (mg/L) Distribution: All Classification Categories with (T) and (TS) designation removed
No lakes in NYS are classified as A-S
| Waterbody Classification | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|
| A | 58.31 | 128.01 | 185.43 | 218.77 | 331.57 | 478.09 | 76 |
| AA | 23.80 | 44.26 | 145.20 | 164.59 | 240.02 | 1095.03 | 53 |
| B | 57.31 | 143.00 | 223.70 | 257.59 | 596.34 | 7828.50 | 135 |
| C | 17.44 | 57.05 | 138.12 | 155.84 | 278.02 | 937.85 | 157 |
Figure 9: Predicted Lake Epilimnetic TDS (mg/L) Distribution: All Classification Categories with (T) and (TS) designations removed
| Waterbody Classification | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|
| A | 51.98 | 139.84 | 209.03 | 257.09 | 450.82 | 1218.45 | 55 |
| AA | 29.99 | 49.19 | 156.71 | 185.67 | 257.59 | 1445.57 | 43 |
| B | 53.21 | 140.12 | 224.74 | 240.55 | 588.21 | 1459.37 | 72 |
| C | 21.96 | 32.79 | 100.74 | 139.04 | 485.64 | 1172.86 | 62 |
Figure 10: Predicted Lake Hypolimnetic TDS (mg/L) Distribution: All Classification Categories with (T) and (TS) designations removed
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 0.40 | 6.7 | 23.40 | 26.24 | 133.85 | 1315 | 199 |
| 59 | Northeastern Coastal Zone | 32.10 | 64.5 | 118.50 | 133.00 | 263.45 | 361 | 114 |
| 60 | Northern Allegheny Plateau | 11.70 | 20.4 | 36.95 | 42.92 | 81.39 | 173 | 343 |
| 61 | Erie Drift Plain | 17.10 | 21.9 | 30.00 | 31.98 | 37.48 | 43 | 13 |
| 62 | North Central Appalachians | 12.96 | 20.7 | 33.65 | 35.72 | 60.20 | 654 | 28 |
| 64 | Northern Piedmont | 58.42 | 75.5 | 85.05 | 86.82 | 122.30 | 137 | 7 |
| 67 | Ridge and Valley | 18.70 | 51.4 | 82.80 | 86.32 | 163.80 | 248 | 59 |
| 83 | Eastern Great Lakes Lowlands | 12.65 | 34.9 | 61.55 | 75.68 | 141.85 | 585 | 403 |
| 84 | Atlantic Coastal Pine Barrens | 25.00 | 32.0 | 55.60 | 61.80 | 88.60 | 118 | 21 |
Figure 11: Stream Ecoregional Chloride (mg/L) Distribution
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 0.25 | 4.02 | 22.35 | 29.90 | 57.39 | 221.0 | 250 |
| 59 | Northeastern Coastal Zone | 33.60 | 66.50 | 103.00 | 146.00 | 233.50 | 269.5 | 53 |
| 60 | Northern Allegheny Plateau | 4.74 | 12.50 | 31.80 | 34.82 | 52.52 | 111.0 | 138 |
| 61 | Erie Drift Plain | 5.64 | 12.25 | 18.33 | 20.39 | 24.41 | 25.3 | 17 |
| 62 | North Central Appalachians | 1.95 | 11.90 | 26.60 | 32.10 | 51.97 | 81.4 | 28 |
| 64 | Northern Piedmont | 64.40 | 74.60 | 79.50 | 82.72 | 92.38 | 95.6 | 5 |
| 67 | Ridge and Valley | 8.54 | 24.25 | 57.80 | 59.48 | 86.29 | 99.7 | 11 |
| 83 | Eastern Great Lakes Lowlands | 5.90 | 18.88 | 46.11 | 52.40 | 146.40 | 363.5 | 96 |
| 84 | Atlantic Coastal Pine Barrens | 23.50 | 29.50 | 57.20 | 58.10 | 111.90 | 187.5 | 33 |
Figure 12: Lake Ecoregional Epilimnetic Chloride (mg/L) Distribution
| Ecoregion # | Ecoregion Name | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|---|
| 58 | Northeastern Highlands | 0.25 | 3.85 | 18.08 | 22.60 | 54.35 | 86.50 | 166 |
| 59 | Northeastern Coastal Zone | 25.15 | 41.00 | 65.70 | 65.86 | 79.31 | 80.55 | 29 |
| 60 | Northern Allegheny Plateau | 8.66 | 17.35 | 33.27 | 36.64 | 58.33 | 71.00 | 79 |
| 61 | Erie Drift Plain | 8.04 | 14.50 | 20.81 | 21.35 | 28.21 | 30.50 | 9 |
| 62 | North Central Appalachians | 1.00 | 11.90 | 13.50 | 29.72 | 70.67 | 81.75 | 16 |
| 64 | Northern Piedmont | 74.30 | 81.90 | 89.50 | 91.02 | 95.58 | 97.10 | 2 |
| 67 | Ridge and Valley | 0.25 | 0.25 | 29.88 | 35.80 | 53.57 | 59.50 | 5 |
| 83 | Eastern Great Lakes Lowlands | 4.23 | 18.85 | 40.74 | 48.50 | 141.00 | 471.00 | 49 |
| 84 | Atlantic Coastal Pine Barrens | 15.00 | 22.70 | 39.55 | 43.10 | 53.75 | 57.30 | 7 |
Figure 13: Lake Ecoregional Hypolimnetic Chloride (mg/L) Distribution
| Waterbody Class | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|
| A | 5.85 | 22.15 | 56.10 | 68.86 | 146.00 | 654.0 | 87 |
| A-S | 17.60 | 17.60 | 17.60 | 17.60 | 17.60 | 17.6 | 1 |
| AA | 4.74 | 13.20 | 50.40 | 53.00 | 103.08 | 128.0 | 43 |
| B | 14.35 | 30.65 | 59.16 | 68.52 | 132.52 | 274.0 | 180 |
| C | 10.90 | 24.17 | 54.91 | 61.60 | 138.65 | 1315.0 | 830 |
| D | 11.10 | 22.80 | 57.70 | 69.46 | 161.20 | 209.0 | 39 |
Figure 14: Stream Chloride (mg/L) Distribution: All Classification Categories with (T) and (TS) designation removed
No lakes in NYS are classified as A-S
| Waterbody Classification | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|
| A | 7.40 | 22.90 | 36.70 | 53.00 | 75.10 | 104.0 | 84 |
| AA | 0.91 | 9.39 | 27.26 | 34.38 | 63.47 | 118.0 | 72 |
| B | 10.49 | 24.73 | 48.02 | 53.82 | 111.42 | 363.5 | 234 |
| C | 0.25 | 1.95 | 14.63 | 18.50 | 56.60 | 363.5 | 170 |
Figure 15: Lake Epilimnetic Chloride (mg/L) Distribution: All Classification Categories with (T) and (TS) designations removed
| Waterbody Classification | 25th percentile | Median | 75th percentile | 80th percentile | 95th percentile | Maximum | # of sites |
|---|---|---|---|---|---|---|---|
| A | 8.65 | 22.10 | 35.91 | 51.20 | 65.83 | 97.1 | 74 |
| AA | 1.40 | 11.62 | 31.21 | 35.54 | 76.62 | 118.0 | 58 |
| B | 10.30 | 19.42 | 41.80 | 47.36 | 78.78 | 471.0 | 133 |
| C | 0.25 | 1.00 | 7.13 | 9.24 | 53.24 | 471.0 | 77 |
Figure 16: Lake Hypolimnetic Chloride (mg/L) Distribution: All Classification Categories with (T) and (TS) designations removed
Figure 17: Linear regression of TDS and Chloride
Figure 18: Linear regression of TDS and Chloride with reduced scale range
| Ecoregion Number / Name | Open Water | Developed Open Space | Developed Low Intensity | Developed Medium Intensity | Developed High Intensity | Barren | Deciduous Forest | Evergreen Forest | Mixed Forest | Shrub-Scrub | Grassland-Herbaceous | Pasture-Hay | Cultivated Crops | Woody Wetland | Emergent-Herbaceous Wetlands |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 58 Northeastern Highlands | 3.48 | 2.46 | 0.55 | 0.19 | 0.04 | 0.15 | 49.64 | 16.95 | 11.77 | 1.21 | 0.72 | 3.45 | 0.91 | 8.01 | 0.47 |
| 59 Northeastern Coastal Zone | 4.48 | 13.33 | 9.33 | 8.22 | 5.35 | 0.57 | 23.87 | 3.82 | 8.10 | 0.26 | 0.77 | 10.66 | 3.08 | 7.27 | 0.87 |
| 60 Northern Allegheny Plateau | 1.47 | 4.86 | 1.05 | 0.32 | 0.09 | 0.16 | 39.74 | 5.05 | 16.01 | 0.68 | 0.53 | 18.29 | 8.38 | 2.91 | 0.48 |
| 61 Erie Drift Plain | 2.28 | 4.60 | 1.26 | 0.39 | 0.08 | 0.10 | 39.69 | 3.14 | 13.06 | 0.38 | 0.42 | 21.23 | 5.45 | 6.77 | 1.15 |
| 62 North Central Appalachians | 2.11 | 4.19 | 0.80 | 0.30 | 0.07 | 0.32 | 51.88 | 5.36 | 25.88 | 0.54 | 0.50 | 4.64 | 0.66 | 2.49 | 0.26 |
| 64 Northern Piedmont | 12.04 | 25.60 | 14.35 | 16.48 | 4.35 | 0.87 | 17.46 | 0.09 | 0.79 | 0.33 | 0.72 | 0.61 | 0.05 | 4.52 | 1.75 |
| 67 Ridge and Valley | 1.05 | 8.15 | 3.56 | 1.57 | 0.65 | 0.15 | 40.99 | 1.02 | 6.34 | 0.19 | 0.89 | 18.56 | 3.60 | 12.02 | 1.27 |
| 83 Eastern Great Lakes Lowlands | 4.27 | 5.77 | 3.41 | 1.40 | 0.59 | 0.30 | 22.86 | 4.92 | 4.63 | 0.95 | 0.91 | 18.49 | 17.64 | 12.57 | 1.29 |
| 84 Atlantic Coastal Pine Barrens | 2.54 | 17.69 | 18.65 | 14.82 | 5.69 | 2.09 | 14.52 | 5.61 | 4.27 | 0.62 | 1.48 | 4.20 | 1.97 | 1.93 | 3.93 |
| Ecoregion Number / Name | Mean | Standard Deviation |
|---|---|---|
| 58 Northeastern Highlands | 0.44 | 3.95 |
| 59 Northeastern Coastal Zone | 14.25 | 26.14 |
| 60 Northern Allegheny Plateau | 0.87 | 5.48 |
| 61 Erie Drift Plain | 1.01 | 5.87 |
| 62 North Central Appalachians | 0.69 | 4.97 |
| 64 Northern Piedmont | 20.91 | 27.11 |
| 67 Ridge and Valley | 3.20 | 11.78 |
| 83 Eastern Great Lakes Lowlands | 2.96 | 11.52 |
| 84 Atlantic Coastal Pine Barrens | 22.37 | 27.82 |
Figure 19: Map of actual maximum TDS by site
Figure 20: Map of predicted maximum TDS by site
Figure 19: Map of actual maximum TDS by site